The wavelength of light visible to the human eye is on the order of 5 × 10^?7 m. If the speed of light in air is 3 × 10^8 m/s, find the frequency of the lightwave
a. 3 × 10^7 Hz
b. 4 × 10^9 Hz
c. 5 × 10^11 Hz
d. 6 × 10^14 Hz
e. 4 × 10^15 Hz
d
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One sees differences in ________ depending on the time in the sunspot cycle. I. the latitude at which most sunspots occur II. the number of sunspots that are visible III. the rotation rate of the Sun's equator IV. the magnetic polarity of the sunspot pair members in a hemisphere
a. I & II b. I & IV c. II & III d. I, II & III e. I, II, & IV
On bracket ABCDEF, each y-direction force acts at the center of the bar segment to which it is applied (see figure). All turns of ABCDEF are 90o angles. The resultant moment at B (MB) for this parallel force system is (in N?m)
(A) 395j 1 1080k
(B) 415i 1 875k
(C) 485i 2 913k
(D) 2485i 1 913k
What is one "kilowatt-hour" [kW ? h]?
A) It is the energy output of one kilowatt operating for one hour. B) It is work done continuously for one hour. C) It is the force output of one kilowatt operating for one hour. D) It is the power output of a one kilowatt device. E) Actually, nobody knows what this term means.
In the equation A = B/C, the A and B are said to be _______________ proportional
a. directly b. inversely c. not d. exactly